Bicycle frame



FIG. 1 is a side elevational view of the bicycle frame of the present invention showing my new design with the phantom lines depicting environmental structure forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear end view thereof;

FIG. 4 is a front end view thereof; and,

FIG. 5 is a top perspective view thereof. 

The ornamental design for a bicycle frame, as shown and described. 